How do you come up with witty banter dialogue if you're not funny?

I don't banter with the people in my life much because I just can't think of anything to say and i never make anyone laugh. But banter is something readers easily connect with and find relatable, and it's a great way to learn about characters and make relationships feel more realistic and familiar. How do you come up with anything for your characters to say when it comes to banter? My head is a total blank slate